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I am a professional airsmith up in NorCal and I ordered one of these a month or so ago for a CA MP5SD. The parts came well packaged and seemed to be of good quality. the rubber padding on the cylinder back was good quality and seems to dampen the impact of the piston head well. The piston head is nice and smooth on the face with decent holes drilled in it. Bearings are of good quality and the O-ring is well, an o-ring. I replace all o-rings with ones i get from the auto parts store anyway...you can get the same size o-rings, but theyre made for a lot heavier use and create a much better seal on the cylinder. The only thing I wish this had was a dual o-ring seal on the cylinder head like the guarder ones, but other than that...great quality for the price!
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Submited By: Rob A.
